卧式离心铸管充型过程中夹杂物运动规律数值模拟研究及应用

Numerical Simulation and Application of Inclusion Movement in Horizontal Centrifugal Casting Pipe Filling Process

对卧式离心铸造充型过程中流体质点受力进行分析,根据夹杂物运动规律推断出不同种类夹杂物沉淀分离时间及最佳浇注温度。基于Procast软件建立了卧式离心铸造充型过程夹杂物运动模型,对离心铸管在不同转速条件下夹杂物运动轨迹及最终停留位置进行了数值模拟及工艺优化。结果表明,夹杂物密度越小、粒子尺寸越大,分离时间越短。5μm的SiO_(2)夹杂最容易在离心力的作用下从金属液中甩出,并最终停留在铸管内表面。适合L605离心铸管最佳浇注温度为1580℃,离心转速为2800r/min。在此工艺参数条件下,对离心铸管进行了实际浇铸实验,利用光学显微镜(OM)、扫描电镜(SEM及EDS)获得其夹杂物分布和成分信息。实际铸件夹杂微观分析结果与数值模拟的一致,验证了预测及模拟结果的有效性。

The applied force of fluid particles in the filling process of horizontal centrifugal casting was analyzed,and the precipitation separation time of different kinds of inclusions and optimal pouring temperature were deduced according to the movement law of inclusions.The movement trajectory of inclusions in the filling process of horizontal centrifugal casting was established using Pro CAST software,and the numerical simulation and process optimization of the movement trajectory and final residence position of inclusions in centrifugal casting pipes under different rotating speeds were carried out.The results show that the smaller the density of inclusions is and the larger the particle size is,the shorter the separation time is.It is found that 5 μm SiO_(2) inclusions are most likely to be thrown out of the liquid metal under the action of centrifugal force and finally stay on the inner surface of the cast pipe.The optimal pouring temperature for L605 centrifugal casting pipe is 1580 ℃,and the optimal centrifugal speed is 2800 r/min.Under the condition of these optimal process parameters,the actual casting experiment of centrifugal cast pipe was carried out,and the inclusion distribution information was obtained by optical microscope(OM) and scanning electron microscope(SEM-EDS).The microscopic analysis result of inclusions in actual castings is consistent with the simulation result,which verifies the effectiveness of the prediction and simulation results.